Rotor blade for a turbomachine

(19)

(11)

EP 1 559 871 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	07.01.2009 Bulletin 2009/02

(43)	Date of publication A2:
	03.08.2005 Bulletin 2005/31

(21)	Application number: 05250504.7

(22)	Date of filing: 31.01.2005

(51)

International Patent Classification (IPC):

F01D 5/14^(2006.01)

F01D 11/08^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR LV MK YU

(30)

Priority:

31.01.2004 US 770331

(71)	Applicant: United Technologies Corporation
	Hartford, CT 06101 (US)

(72)	Inventors:
	Dube, Bryan P. Colombia CT 06237 (US) Gray, Eric D. Wallingford CT 06232 (US)

(74)	Representative: Leckey, David Herbert
	Frank B. Dehn & Co. St Bride's House 10 Salisbury Square London EC4Y 8JD London EC4Y 8JD (GB)

(54)	Rotor blade for a turbomachine

(57) A rotor blade (14) having an airfoil (18) and beam construction for a tip shroud (30) is disclosed. Various construction details are developed for providing a transition zone (34) that extend from the sides (26,24) of the airfoil (18) to limit stesses at shroud-airfoil interface, at the disk-root interface and to extend the creep life of the blade while providing a flow path surface of the shroud (30).

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